I don't know if you have had the experience of recovering a bullet from something like a Moose.... but it is not uncommon to find a perfectly mushroomed .308 cal bullet under the hide on the far side, with the hide having detached from the body over a diameter of nearly a foot.... After losing all the energy passing through flesh and bone, when the bullet hits the very elastic hide, it stretches away from the body, acting like a big net and slowing the bullet to a stop before snapping back....
This Marmot hide performed in an identical fashion, their hide is very thick and tough.... It was detached from the body over quite a large area, with the pellet imbedded in the fat lining inside the hide.... The shoulder bone on the entrance side took the initial impact, and the pellet deflected down through a rib on the far side, shattering it, before exiting muscle and hitting the hide.... This was a large Marmot, and they are built like little Bears.... very solid animals.... Every one I have hit in the head has ended up with an exit hole, regardless of impact angle, even with a .22 cal at 37 FPE.... although I don't usually take a shot on one with a .22 cal at much over 25 yards.... I hit one last year, in the head, with a 34 gr. JSB King Heavy at 85 yards, and it was a complete pass through.... knocked him right off the stump he was sitting on....
Bob